| 摘要 |
PCT No. PCT/EP95/02704 Sec. 371 Date Apr. 3, 1997 Sec. 102(e) Date Apr. 3, 1997 PCT Filed Jul. 10, 1995 PCT Pub. No. WO96/01683 PCT Pub. Date Jan. 25, 1996Structures comprising an upper crystalline molecular sieve layer on a support, the crystals being at least partially oriented normal to the plane of the layer, there being a dense intermediate crystalline molecular sieve layer between the support and upper layer. |
